IMPROVED GRAPHITE MATERIALS FOR HIGHTEMPERATURE AEROSPACE USE. VOLUME I. RESEARCH AND DEVELOPMENT FOR IMPROVED GRAPHITE MATERIALS.
Rept. for 1 May 63-31 Mar 64.
UNION CARBIDE CORP LAWRENCEBURG TENN CARBON PRODUCTS DIV
Pagination or Media Count:
The pyrolysis behavior of two different pitches has been examined in a thermogravimetric apparatus. Electron spin resonance ESR spectra have been obtained under conditions of high resolution for solutions of acenaphthylene in m-quinquephenyl. Nuclear magnetic resonance NMR measurements are reported for some aromatic ions, aromatic pyrolysis products, and complex raw materials for graphite. The thermal decomposition of organic diazocompounds has been investigated as an example of a pyrolysis reaction involving radical intermediates but yielding stable diamagnetic products. X-ray data have been obtained for the 002 semilattice spacing in graphite prepared from pure aromatic hydrocarbons and from complex raw materials. Molecular structure is seen to influence graphite properties, through both steric and reactivity effects. The addition of carbon blacks to coking charge stocks prior to the coking operation results in cokes which have isotropic high thermal expansion characteristics. Testing shows that the original coke properties affect the final graphite properties.